There is no comparison between nursing school and NA school. No one can really explain how much material you will need to read, understand, and be tested on. I am in a front loaded program, and we are taking 8 classes this semester: Biochem, Neuro, Physiology, Basics of anesthesia, Ethics, (2) research classes (lectures/tests in one and assignments in both), and operational readiness (it is a military program). It is not that anyone of the classes is overly difficult, but the amount of material in such a short time can seem overwhelming at times.
For example in basics of anesthesia class: There are 4 tests this semester each test covers somewhere between 600-900 power point slides, so we will have covered about 3000+ power point slides for this semester + 1-4 chapters that you are supposed to read for the 2 lectures each week. Now mulitply that by 4 and then add all the extra work in the other 4 classes (I have 9+papers to write this semester alone).